The original question was: The plague numbers of Australian rabbits originally exposed to the myxoma virus had a mortality rate up to 99% in some areas. Over generations rabbits have gained resistance to the virus and their mortality rate has dropped to almost insignificance. Studies have shown that the virus has also changed to become […]
The original question was: I have been advised to have another “flu shot” because the flu virus is evolving, so I am no longer immune through last year’s shot. Also, how come people can get swine flu or bird flu if it has not evolved? Answer by Diane Eager The Influenza A virus certainly does […]
When did these diseases enter the human race?